Cephalid Facetaker 
Creature — Octopus Rogue
$5.46 #6836 0.33 4.4 years
This creature can't be blocked.
At the beginning of combat on your turn, you may have this creature become a copy of another target creature until end of turn, except it's 1/4 and has "This creature can't be blocked."
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Cards similar to Cephalid Facetaker expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Cryptoplasm90%
$0.63↓#12679↓0.07↓15.6 years↑
"At the beginning of your upkeep, you may have this creature become a copy of another target creature, except it has this ability."
Mindlink Mech82%
$0.25↓#11590↓0.50↑4.5 years
"Whenever this Vehicle becomes crewed for the first time each turn, until end of turn, this Vehicle becomes a copy of target nonlegendary creature that crewed it this turn, except it's 4/3, it's a Vehicle artifact in addition to its other types, and it has flying."
Artisan of Forms80%
$0.23↓#16795↓0.3612.9 years↑
"Whenever you cast a spell that targets this creature, you may have this creature become a copy of target creature, except it has this ability."
Cemetery Puca79%
$2.77↓#19602↓0.2518.3 years↑
"Whenever a creature dies, you may pay 
. If you do, this creature becomes a copy of that creature, except it has this ability."
. If you do, this creature becomes a copy of that creature, except it has this ability."
Irma, Part-Time Mutant78%
$4.61↓#3753↑0.00↓0.5 years↓
"At the beginning of combat on your turn, this card becomes a copy of up to one other target creature you control, except her name is this card and she has this ability. Then put a +1/+1 counter on her."
Hulkling, Young Avenger78%
$0.30↓#20498↓0.00↓0.2 years↓
"Whenever you cast a noncreature spell, this card becomes a copy of up to one other target creature until end of turn, except his name is this card, he's 4/4, and he has flying and this ability."
Kimahri, Valiant Guardian78%
$0.25↓#70410.281.2 years↓
"At the beginning of combat on your turn, put a +1/+1 counter on this card and tap target creature an opponent controls. Then you may have this card become a copy of that creature, except its name is this card and it has vigilance and this ability."
Cytoshape77%
$0.49↓#26270↓0.3720.3 years↑
"Choose a nonlegendary creature on the battlefield. Target creature becomes a copy of that creature until end of turn."
Permeating Mass76%
$0.31↓#18154↓0.06↓10.1 years↑
"Whenever this creature deals combat damage to a creature, that creature becomes a copy of this creature."
Blade of Shared Souls76%
$0.25↓#12177↓0.333.6 years
"Whenever this Equipment becomes attached to a creature, for as long as this Equipment remains attached to it, you may have that creature become a copy of another target creature you control."
Mimeoplasm, Revered One76%
$0.36↓#14299↓0.251.6 years↓
": this card becomes a copy of target creature card exiled with it, except it's 0/0 and has this ability."
: this card becomes a copy of target creature card exiled with it, except it's 0/0 and has this ability."
Deepfathom Echo76%
$0.33↓#9712↓0.12↓2.8 years↓
"At the beginning of combat on your turn, this creature explores. Then you may have it become a copy of another creature you control until end of turn."
Silent Hallcreeper74%
$1.97↓#1442↑0.241.9 years↓
"• This creature becomes a copy of another target creature you control."
+1 more matching line
Taskmaster, Mercenary Mimic74%
$0.68↓#9620↓0.00↓0.2 years↓
"At the beginning of your first main phase, until your next turn, this card becomes a copy of up to one target creature on the battlefield or creature card in a graveyard, except his name is this card and he's a legendary Human Mercenary Villain creature."
Mirror of the Forebears74%
$1.63↓#10360↓0.53↑9.0 years↑
": Until end of turn, this artifact becomes a copy of target creature you control of the chosen type, except it's an artifact in addition to its other types."
: Until end of turn, this artifact becomes a copy of target creature you control of the chosen type, except it's an artifact in addition to its other types."
Volrath, the Shapestealer73%
$0.68↓#13602↓0.50↑7.0 years↑
": Until your next turn, this card becomes a copy of target creature with a counter on it, except it's 7/5 and it has this ability."
: Until your next turn, this card becomes a copy of target creature with a counter on it, except it's 7/5 and it has this ability."
Quicksilver Gargantuan73%
$0.54↓#18240↓0.14↓15.9 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it's 7/7."
Shameless Charlatan73%
$0.22↓#20456↓0.364.2 years
"Commander creatures you own have ": This creature becomes a copy of another target creature.""
: This creature becomes a copy of another target creature.""
Vectis Agents73%
$0.04↓#31127↓0.2817.6 years↑
"
: This creature gets -2/-0 until end of turn and can't be blocked this turn."
: This creature gets -2/-0 until end of turn and can't be blocked this turn."
Commander Eesha73%
$2.87↓#15828↓0.18↓24.3 years↑
"Flying, protection from creatures"